In a nutshell

Various components of coconut are used in multiple ways. While its water can serve as a replacement for blood plasma, the coir is used to make utility objects 

It has been long debated whether the humble coconut is a fruit, a seed or nut. Whichever category it belongs to, it is undoubtedly versatile and indispensable for most people under the tropical belt. It is a complete food rich in calories, vitamins and minerals. Here are some facts about coconuts:

• The name coconut is derived from the 16th century Portuguese sailors who thought the three small holes on the coconut shell resembled the human face so dubbed the fruit ‘coco’ meaning ‘grinning face, grin or grimace.’ The word nut was added in English later on.
• Coconut water can be used (in emergencies) as a substitute for blood plasma. The high level of sugar and other salts make it possible to add the water to the bloodstream, similar to how an IV solution works in modern medicine. Coconut water was known to be used during World War II in tropical areas for emergency transfusions.
• They’re rich in lauric acid, which converts to monolaurin. Monolaurin is the compound found in breast milk that strengthens a baby’s immunity and a great deal of research has been done to establish the ability of lauric acid to enhance immunity. This medium-chain fatty acid (MCFA) actually disrupts the lipid membranes of offending organisms.
• They offer high levels of manganese, potassium and phosphorus. They’re loaded with naturally sterile electrolytes, which feed pH and muscle function and have a high fiber content, which makes you feel full longer.
• Coconut oil extracted from dry nut is an excellent emollient agent. It is used in cooking, to help scalp hair nourishment, in pharmacy and in medicines.
• Aside from their culinary purposes, they are also used for cosmetic purposes and as a mosquito repellent by burning the coir. The coir is also used for making ropes, mats, brushes, sacks and as stuffing for mattresses.
• The coconut does not get dispersed like other drupe fruits (through consumption by wildlife). Instead the coconut palm disperses its seed using the ocean. A coconut is very buoyant and highly water resistant and can travel very long distances across the ocean.